diff --git a/src/Makefile.config b/src/Makefile.config
index a1b8699c..1df09f65 100644
--- a/src/Makefile.config
+++ b/src/Makefile.config
@@ -1,5 +1,5 @@
 #=======================================================================
-#                   Mac OS X Monterey  Makefile.config 
+#                   Generic Makefile.config 
 #-----------------------------------------------------------------------
 # This file is used as a template for Makefile.config if there is not
 # a predefined file in ${CWPROOT}/src/configs.
@@ -48,8 +48,7 @@ include $(CWPROOT)/src/Rules/opengl.rules
 LINEHDRFLAG = 
 XDRFLAG = -DSUXDR
 ENDIANFLAG = -DCWP_LITTLE_ENDIAN
-#LARGE_FILE_FLAG = -D_FILE_OFFSET_BITS=64 -D_LARGEFILE64_SOURCE -DGNU_SOURCE
-LARGE_FILE_FLAG =
+LARGE_FILE_FLAG = -D_FILE_OFFSET_BITS=64 -D_LARGEFILE64_SOURCE
 
 CWP_FLAGS = $(LARGE_FILE_FLAG) $(ENDIANFLAG) $(XDRFLAG) $(LINEHDRFLAG)
 
@@ -76,10 +75,8 @@ POSTLFLAGS =
 
 IX11 = /usr/X11/include
 LX11 = /usr/X11/lib
-#IMOTIF = /usr/X11R6/include
-#LMOTIF = /usr/X11R6/lib
-IMOTIF = /opt/local/include
-LMOTIF = /opt/local/lib
+IMOTIF = /usr/X11R6/include
+LMOTIF = /usr/X11R6/lib
 
 LD_LIBRARY_PATH += $(CWPROOT)/lib:${LX11}:${LMOTIF}
 
@@ -87,17 +84,18 @@ LD_LIBRARY_PATH += $(CWPROOT)/lib:${LX11}:${LMOTIF}
 # Gnu compilers by default just because they are the most common
 #-----------------------------------------------------------------------
 
-CPP = /usr/bin/cpp
+CPP = cpp
 
-CC = /usr/bin/gcc
-#OPTC = -g -c90  -m64 -Wall -ansi  -Wno-long-long 
-#OPTC = -g -std=c90  -m64 -Wall -ansi  -Wno-long-long 
-OPTC = -g -std=c99  -m64 -Wall -ansi  -Wno-long-long 
+CC = gcc
+OPTC = -g -std=c99 -Wall -pedantic -Wno-long-long -D_GNU_SOURCE -D_POSIX_C_SOURCE=200809L
 CFLAGS = -I$I $(OPTC) $(CWP_FLAGS)
+CFLAGS += -I/usr/include/tirpc
 
-# if gfortran is made using Homebrew
 FC = gfortran
 FOPTS = -g 
-FFLAGS = $(FOPTS) -ffixed-line-length-none  -fallow-argument-mismatch
+FFLAGS = $(FOPTS) -ffixed-line-length-none
 
 C++FLAGS = -I$I $(OPTC) $(CWP_FLAGS)
+
+LDFLAGS = -ltirpc
+POSTLFLAGS = -ltirpc
diff --git a/src/Makefile.config_old b/src/Makefile.config_old
new file mode 100644
index 00000000..4cefb6cb
--- /dev/null
+++ b/src/Makefile.config_old
@@ -0,0 +1,99 @@
+#=======================================================================
+#                   Generic Makefile.config 
+#-----------------------------------------------------------------------
+# This file is used as a template for Makefile.config if there is not
+# a predefined file in ${CWPROOT}/src/configs.
+#
+# Likely source of issues will be the setting of preprocessor symbols
+# to properly pick up common, non-ANSI & non-POSIX extensions in
+# /usr/include/stdio.h for popen(3c), pclose(3c), fdopen(3c), etc.
+#
+# If you are using this file rather than a preconfigured version
+# please post it to the seisunix mailing list along w/ the output
+# from the sys_arch command.
+#
+#=======================================================================
+
+
+#-----------------------------------------------------------------------
+# pick up the Make rules (Gnu make required)
+#-----------------------------------------------------------------------
+
+include $(CWPROOT)/src/Rules/gnumake.rules
+include $(CWPROOT)/src/Rules/abbrev.rules
+include $(CWPROOT)/src/Rules/cflags.rules
+include $(CWPROOT)/src/Rules/suffix.rules
+include $(CWPROOT)/src/Rules/misc.rules
+include $(CWPROOT)/src/Rules/opengl.rules
+
+#-----------------------------------------------------------------------
+#                      CWP feature options
+#-----------------------------------------------------------------------
+#
+# LINEHDRFLAG=SU_LINEHEADER  - adds 3200 byte text & 400 byte SEG-Y 
+#                              style line headers to output. CWP/SU
+#                              always reads either format unless SUXDR
+#                              has been selected.
+#
+# XDRFLAG=-DSUXDR            - forces all SU data to be big endian
+#                              independent of processor architecture
+#
+# LARGE_FILE_FLAG            - controls access to files > 2 GB on
+#                              some systems.
+#
+# -DSLTSU_SEGY_H             - if defined selects SLT/SU trace header
+#                              layout so both packages are compatible
+#-----------------------------------------------------------------------
+
+LINEHDRFLAG = 
+XDRFLAG = -DSUXDR
+ENDIANFLAG = -DCWP_LITTLE_ENDIAN
+LARGE_FILE_FLAG = -D_FILE_OFFSET_BITS=64 -D_LARGEFILE64_SOURCE
+
+CWP_FLAGS = $(LARGE_FILE_FLAG) $(ENDIANFLAG) $(XDRFLAG) $(LINEHDRFLAG)
+
+#-----------------------------------------------------------------------
+# system stuff
+#-----------------------------------------------------------------------
+
+SHELL = /bin/sh
+ROOT = $(CWPROOT)
+
+LN = ln  # this needs to be changed to cp for FAT32 filesystems
+AR = ar
+ARFLAGS = rv
+RANLIB = ranlib
+RANFLAGS = 
+ICHMODLINE = chmod 644 $@
+MCHMODLINE = chmod 755 $@
+
+POSTLFLAGS = 
+
+#-----------------------------------------------------------------------
+# use both X11 path conventions
+#-----------------------------------------------------------------------
+
+IX11 = /usr/X11/include
+LX11 = /usr/X11/lib
+IMOTIF = /usr/X11R6/include
+LMOTIF = /usr/X11R6/lib
+
+LD_LIBRARY_PATH += $(CWPROOT)/lib:${LX11}:${LMOTIF}
+
+#-----------------------------------------------------------------------
+# Gnu compilers by default just because they are the most common
+#-----------------------------------------------------------------------
+
+CPP = cpp
+
+CC = gcc
+OPTC = -g  -std=c99 -Wall -pedantic -Wno-long-long 
+CFLAGS = -I$I $(OPTC) $(CWP_FLAGS)
+
+FC = gfortran
+FOPTS = -g 
+FFLAGS = $(FOPTS) -ffixed-line-length-none
+
+C++FLAGS = -I$I $(OPTC) $(CWP_FLAGS)
+
+
diff --git a/src/cwp/lib/tempname.c b/src/cwp/lib/tempname.c
index cf1b9b46..0c76ed39 100644
--- a/src/cwp/lib/tempname.c
+++ b/src/cwp/lib/tempname.c
@@ -1,10 +1,16 @@
-/* Copyright (c) Colorado School of Mines, 2011.*/
+/* Copyright (c) Colorado School of Mines, 2012.*/
 /* All rights reserved.                       */
 
 /*********************** self documentation **********************/
 
+#define _POSIX_C_SOURCE 200809L // added - ben
 
 #include "cwp.h"
+/* next 3 lines edited - ben */
+#include <stdio.h>   // for fdopen, FILE
+#include <unistd.h>  // for mkstemp
+#include <stdlib.h>  // for NULL and general utilities
+
 
 /*****************************************************************************
 TEMPORARY_FILENAME - Creates a file name in a user-specified directory.
diff --git a/src/cwp_su_version b/src/cwp_su_version
index 36c6e884..bd46941f 100644
--- a/src/cwp_su_version
+++ b/src/cwp_su_version
@@ -1 +1 @@
-CWP/SU Release 44R24 25 March 2022
+CWP/SU Release 45R00 30 April 2023
diff --git a/src/par/lib/docpkge.c b/src/par/lib/docpkge.c
index c66c0471..e801897d 100644
--- a/src/par/lib/docpkge.c
+++ b/src/par/lib/docpkge.c
@@ -52,6 +52,7 @@ Author: Jack K. Cohen, Center for Wave Phenomena
 ****************************************************************************/
 /**************** end self doc ********************************/
 
+#define _POSIX_C_SOURCE 200809L // added - ben
 
 #include "par.h"
  
diff --git a/src/par/lib/subcalls.c b/src/par/lib/subcalls.c
index 43cfac46..59acfb0e 100644
--- a/src/par/lib/subcalls.c
+++ b/src/par/lib/subcalls.c
@@ -102,6 +102,8 @@ CWP: Shuki Ronen, Jack Cohen
 ***************************************************************************/
 /**************** end self doc ********************************/
 
+#define _POSIX_C_SOURCE 200809L
+
 #include "par.h"
 
 #define ERROR	NULL
diff --git a/src/par/main/ray_theory/rayt2dtopo.c b/src/par/main/ray_theory/rayt2dtopo.c
index 2ed8bc02..7fec9cee 100644
--- a/src/par/main/ray_theory/rayt2dtopo.c
+++ b/src/par/main/ray_theory/rayt2dtopo.c
@@ -177,7 +177,7 @@ void zcoorTopog(float fxs,float dxs,int nxs,Surface *srf,float *sz,
                 float *nangl);
 
 
-main(int argc, char **argv)
+int main(int argc, char **argv)
 {
 	int	na,nat,nt,nxs,nxo,nzo,nx,nz,nxt,nx0,mx,npv,nsrf,*nxzsrf;
 	float	dt,xs,fxs,dxs,exs,fxo,fzo,dxo,dzo,exo,ezo,fa,ea,amin,eat,
diff --git a/src/psplot/main/psepsi.c b/src/psplot/main/psepsi.c
index 9df1efd1..113eb16e 100644
--- a/src/psplot/main/psepsi.c
+++ b/src/psplot/main/psepsi.c
@@ -3,6 +3,8 @@
 
 /* PSEPSI: $Revision: 1.10 $ ; $Date: 2011/11/17 00:10:53 $	*/
 
+#define _POSIX_C_SOURCE 200809L
+#include <stdio.h>
 #include "psplot.h"
 #include "par.h"
 
diff --git a/src/su/include/mkhdr b/src/su/include/mkhdr
index 5479cc9b..9e87f9f6 100755
Binary files a/src/su/include/mkhdr and b/src/su/include/mkhdr differ
diff --git a/src/su/include/mkheader b/src/su/include/mkheader
index fa67f75f..ed6c9ea2 100755
Binary files a/src/su/include/mkheader and b/src/su/include/mkheader differ
diff --git a/src/su/include/mkxdrbhdrsub b/src/su/include/mkxdrbhdrsub
index 7141b05b..b57f36fd 100755
Binary files a/src/su/include/mkxdrbhdrsub and b/src/su/include/mkxdrbhdrsub differ
diff --git a/src/su/include/mkxdrhdrsub b/src/su/include/mkxdrhdrsub
index b171a50f..109902a1 100755
Binary files a/src/su/include/mkxdrhdrsub and b/src/su/include/mkxdrhdrsub differ
diff --git a/src/su/lib/fgettr.c b/src/su/lib/fgettr.c
index af393ba2..85621665 100644
--- a/src/su/lib/fgettr.c
+++ b/src/su/lib/fgettr.c
@@ -59,6 +59,8 @@ Authors: SEP: Einar Kjartansson, Stew Levin CWP: Shuki Ronen, Jack Cohen
  */
 /**************** end self doc ********************************/
 
+#define _POSIX_C_SOURCE 200809L
+
 #ifndef TEST
 
 #ifdef SU_LINE_HEADER
@@ -71,6 +73,10 @@ int out_line_hdr=0;
 
 #endif
 
+#include <strings.h>   // for swab()
+#include <unistd.h>  // for swab() and fileno()
+#include <stdio.h>   // for fileno()
+
 #include "su.h"
 #include "segy.h"